CN111778449A - Improved ferrite square steel roughing roll and preparation method thereof - Google Patents
Improved ferrite square steel roughing roll and preparation method thereof Download PDFInfo
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- CN111778449A CN111778449A CN202010570189.3A CN202010570189A CN111778449A CN 111778449 A CN111778449 A CN 111778449A CN 202010570189 A CN202010570189 A CN 202010570189A CN 111778449 A CN111778449 A CN 111778449A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 30
- 239000010959 steel Substances 0.000 title claims abstract description 30
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 28
- 238000005096 rolling process Methods 0.000 title claims description 20
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 21
- 239000000956 alloy Substances 0.000 claims abstract description 21
- 238000009434 installation Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 239000010955 niobium Substances 0.000 claims abstract description 5
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 5
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 239000011651 chromium Substances 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 239000011733 molybdenum Substances 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 75
- 229910052742 iron Inorganic materials 0.000 claims description 36
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 7
- 150000002910 rare earth metals Chemical class 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 101100524640 Homo sapiens RHBDD1 gene Proteins 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 102100032690 Rhomboid-related protein 4 Human genes 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 239000006063 cullet Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 4
- 238000007373 indentation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000011081 inoculation Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 229910004709 CaSi Inorganic materials 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002936 tranquilizing effect Effects 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention discloses an improved ferrite square steel roughing roll and a preparation method thereof, wherein the roll is provided with two rolls which are distributed in an up-down symmetrical mode, the roll is provided with a roll body made of ferrite alloy, a plurality of rectangular roughing ring grooves are uniformly arranged along the length direction of the roll body, two ends of the roll body are respectively provided with a bearing installation part made of ferrite alloy, the outer side of the bearing installation part at one side is provided with a connecting part made of ferrite alloy, and the outer side of the bearing installation part at the other side is provided with a transmission part made of ferrite alloy; the roughing roll is prepared from the following raw materials in parts by weight: 3.2-3.4% of carbon, 2-2.1% of silicon, 0.5-0.7% of manganese, 0.2-0.4% of chromium, 0.3-0.5% of molybdenum, 1.4-1.6% of nickel, 0.1-0.3% of niobium and 0.05-0.15% of vanadium. The roller prepared by the method has improved and improved tensile strength, wear resistance, thermal crack resistance, impact toughness and uniform hardness.
Description
Technical Field
The invention relates to the technical field of rollers, in particular to an improved ferrite square steel roughing roller and a preparation method thereof.
Background
The square steel has simple shape, the hole pattern is not changed greatly during rolling, but the four sides have the same size, so the square steel has special requirements on the used rollers, particularly the rough roller used by a previous unit has basically the same abrasion on the hole pattern of a rolled piece during rolling operation, and the specification and the size of the finished square steel can be ensured to meet the requirements. Currently, some manufacturers use pearlitic ductile iron and alloy semisteel as the rolls used in the square steel roughing mills. The former is often because of the big problem of hardness drop, after rolling a certain amount, the section position of pass side wall and pass tank bottom appears the slope directional wearing indentation, along with the aggravation of indentation, can directly influence the square steel finished product surface quality, mainly when the indentation reaches certain degree of depth, can make the rolled piece cause fine spot form scale when rolling in the back, lead to the square steel pickling surface to present fine concave and convex spot groove, cause the square steel surface not bright, alloy semisteel roll because of having a small amount of anomalous slice and netted carbide, under the influence of factors such as the hot extrusion of high temperature rolled piece and cooling water circulation, receive rolling time and wearing and tearing in the rolling operation process, the matrix tissue of roll body pass produces the hot crack of fatigue after accelerating the oxidation, then extend and expand, impel the pass to become invalid in advance, and then influence the operating efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, an improved ferrite square steel roughing roll and a preparation method thereof are provided, so that the tensile strength, the wear resistance, the heat crack resistance, the impact toughness and the hardness of the roll are improved and enhanced.
The technical scheme adopted by the invention for solving the technical problems is as follows: the improved ferrite square steel roughing roll is provided with two rolls which are distributed in an up-and-down symmetrical mode, the roll is provided with a roll body made of ferrite alloy, a plurality of rectangular roughing ring grooves are uniformly formed in the length direction of the roll body, two ends of the roll body are respectively provided with a bearing installation part made of ferrite alloy, the outer side of the bearing installation part on one side is provided with a connection part made of ferrite alloy, and the outer side of the bearing installation part on the other side is provided with a transmission part made of ferrite alloy.
More specifically, in the technical scheme, the width of the rectangular rough rolling ring groove occupies 0.15-0.25 of the length of the roller body.
More specifically, in the above technical solution, the roller body, the bearing mounting portion, the connecting portion, and the transmission portion are an integrated structure.
A preparation method of an improved ferrite square steel roughing roll comprises the following specific steps:
the roughing roller is prepared from the following raw materials in parts by weight:
3.20 to 3.40 percent of carbon,
2.00 to 2.10 percent of silicon,
0.50 to 0.70 percent of manganese,
0.20 to 0.40 percent of chromium,
0.30 to 0.50 percent of molybdenum,
1.40 to 1.60 percent of nickel,
0.10 to 0.30 percent of niobium,
0.05 to 0.15 percent of vanadium;
step two, slagging pure molten iron during smelting, adding a slagging agent into the furnace when the temperature of the molten iron is 1200-1250 ℃, adding 8-10 kg of slagging agent into each ton of molten iron, removing slag, then adding 2-4 kg of iron-based heavy rare earth molten iron modifier pure molten iron, and discharging the molten iron for spheroidization when the temperature of the molten iron is 1410-1430 ℃;
step three, spraying alcohol-based paint with the thickness of 4-5 mm on a metal section die of the roller;
step four, after the roller is loaded into the furnace, the temperature is raised to 10-15 ℃ per hour, the roller temperature is raised to 44 ℃, the temperature is preserved for 4 hours, then the temperature is raised to 660 ℃, the temperature is preserved for 6 hours, the temperature is raised to 15-20 ℃ per hour, the temperature is preserved for 6 hours when the roller temperature is raised to 880 ℃, and then the temperature is raised to Acm + 20-30 ℃, the temperature is preserved for 8 hours, and the furnace is cooled and tempered;
step five, rolling a metallographic matrix structure, namely a spherical graphite, special fine-grained metal carbide, an iron body and a tempering structure.
More specifically, in the above technical solution, in the step one, the raw material of the roughing roller further contains phosphorus
0.04% of sulfur
0.02% of magnesium
0.04%。
More specifically, in the above technical scheme, in the second step, the slag former is prepared by mixing 3% -5% of fluorite, 60% -80% of white quartz sand and the balance of cullet.
More specifically, in the above technical scheme, in the second step, 70% of molten iron is first nodulized by a nodulizer, 75Si-Fe is added after the nodulization, the Si content is increased by 0.20% -0.30%, baca is 0.10% -0.20%, then 30% of molten iron is inoculated, and after slagging-off, the molten iron is kept still for 2-3 minutes for pouring, wherein the pouring temperature is 1310-1320 ℃.
More specifically, in the above technical scheme, the nodulizer adopts 1.60% of low silicon magnesium and 0.20% of rare earth magnesium.
More specifically, in the above technical scheme, in the fourth step, the roller is thickened roughly, charged into a furnace and tempered, the temperature is raised to 10-15 ℃ per hour, the temperature is raised to 430-450 ℃ and the furnace is cooled for 8 hours.
More specifically, in the above technical scheme, in the fifth step, the hardness of the roll body of the roll is 48 HSD-50 HSD, and the roll surface is arranged to the holeHardness drop of groove bottom
1.5 HSD, roll tensile Strength
580MPa。
The invention has the beneficial effects that: the improved ferrite square steel roughing roll and the preparation method thereof provided by the invention have reasonable structural design, improve and enhance the uniformity of the tensile strength, the wear resistance, the heat crack resistance, the impact toughness and the hardness of the roll, and meet the use requirements of steel rolling enterprises.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
The reference numbers in the figures are: 1. a roll body; 2. rectangular rough rolling ring grooves; 3. a bearing mounting portion; 4. a connecting portion; 5. a transmission part.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "one side", "the other side", "both sides", "between", "middle", "upper", "lower", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The improved ferrite square steel roughing roll is characterized in that rare earth magnesium and CaSi spheroidization and CaBa continuous inoculation are carried out, after high-quality nodular molten iron is poured, in the cooling solidification process, part of carbon elements reasonably and uniformly form 1-2 mu m spherical graphite, and part of carbon elements and other alloy elements form metal type carbides, and after special high-temperature heat treatment, the special carbides are uniformly and finely distributed in a matrix, so that the uniformity of the tensile strength, the wear resistance, the thermal crack resistance, the impact toughness and the hardness of the roughing roll are improved. The rough roller is used on a Bao steel machine, the hole pattern of the object is worn uniformly, the repair amount is small, the rough roller is used for 2 times more than that of the traditional roller, the rolling amount is increased by more than 3 times, and better use benefit is obtained.
The ferrite square steel rough roller is provided with two rollers which are distributed in an up-and-down symmetrical mode, the roller is provided with a roller body 1 made of ferrite alloy, a plurality of rectangular rough rolling ring grooves 2 are uniformly arranged along the length direction of the roller body 1, two ends of the roller body 1 are respectively provided with a bearing installation part 3 made of ferrite alloy, the outer side of the bearing installation part 3 on one side is provided with a connecting part 4 made of ferrite alloy, and the outer side of the bearing installation part 3 on the other side is provided with a transmission part 5 made of ferrite alloy. The roller body 1, the bearing mounting part 3 and the connecting part 4 are all of a cylindrical structure.
Wherein, the transmission part 5 adopts a flat square transmission part. The axial line of the roller body 1, the axial line of the rectangular rough rolling ring groove 2, the axial line of the bearing installation part 3, the axial line of the connecting part 4 and the axial line of the transmission part 5 are positioned on the same straight line. And a fillet is arranged at the joint of the roller body 1 and the bearing installation part 3. The width dimension of the rectangular rough rolling ring groove 2 occupies 0.15-0.25 of the length dimension of the roller body 1. The roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are of an integrated structure, namely, the roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are all made of the same material, and the roller body 1, the bearing installation part 3, the connection part 4 and the transmission part 5 are of an integrated structure.
The preparation method of the improved ferrite square steel roughing roll comprises the following specific manufacturing processes:
firstly, chemical components are optimally configured, and a roller is prepared from the following raw materials in parts by weight: carbon: 3.20% -3.40%, silicon: 2.00% -2.10%, manganese: 0.50-0.70 percent of phosphorus
0.04% of sulfur
0.02%, chromium: 0.20-0.40%, molybdenum: 0.30% -0.50%, nickel: 1.40% -1.60%, niobium: 0.10% -0.30%, vanadium: 0.05 to 0.15 percent of magnesium
0.04 percent. The addition of niobium and vanadium increases the red hardness of the hole pattern during the rolling operation of the rough roller, and the rough roller is fully quenched, thereby prolonging the service life of the roller.
Step two, slagging pure molten iron in smelting, adding 3-5% of fluorite and 60-80% of white quartz sand into the furnace when the temperature of the molten iron is 1200-1250 ℃, adding 8-10 kg of slagging agent into each ton of molten iron, deslagging, then adding 2-4 kg of iron-based heavy rare earth molten iron modifier pure molten iron, discharging the molten iron to carry out spheroidization when the temperature of the molten iron is 1410-1430 ℃, discharging 70% of molten iron in the first step, adopting 1.60% of low silicon magnesium and 0.20% of rare earth magnesium as the spheroidizing agent, adding 75Si-Fe after the spheroidization, increasing the Si content by 0.20-0.30%, BaCa0.10-0.20%, then discharging 30% of molten iron for inoculation, tranquilizing for 2-3 minutes after slagging, and casting at the casting temperature of 1310-1320 ℃.
And step three, spraying alcohol-based paint with the thickness of 4-5 mm on the metal section die of the roller.
And step four, special heat treatment, namely normalizing as a preliminary heat treatment, so that the roller provides proper hardness for machining, the structure crystal grains of the roller are refined, casting stress is eliminated, the strip-shaped structure is eliminated, and a proper structure state is provided for final heat treatment. After the roller is loaded into the furnace, the temperature is raised to 10-15 ℃ per hour, the roller temperature is raised to 44 ℃, the temperature is preserved for 4 hours, then the temperature is raised to 660 ℃, the temperature is preserved for 6 hours, then the temperature is raised to 15-20 ℃ per hour, the roller temperature is preserved for 6 hours when the roller temperature is raised to 880 ℃, then the temperature is raised to Acm + 20-30 ℃, the temperature is preserved for 8 hours, the furnace is cooled and tempered, the special alloy carbide in the shape of fine particles can be obtained by tempering, and the special alloy carbide is discontinuous and has tempered matrix structure, so that the comprehensive. Tempering: the roller is thickened, loaded in a furnace and tempered, the temperature is raised to 10-15 ℃ per hour, the temperature is raised to 430-450 ℃ and the furnace cooling is kept for 8 hours.
Step five, the hardness of the roll body of the roll is 48 HSD-50 HSD, and the hardness fall from the roll surface to the groove bottom of the hole pattern
1.5 HSD, roll tensile Strength
580MPa, a metallographic matrix structure of the roller, spherical graphite, special fine grained metal carbide, iron body and a tempering structure.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. An improved ferrite square steel roughing roll is characterized in that: the roll comprises two rolls which are distributed in an up-and-down symmetrical mode, wherein each roll is provided with a roll body (1) made of ferrite alloy, a plurality of rectangular rough rolling ring grooves (2) are uniformly formed in the length direction of the roll body (1), two ends of the roll body (1) are respectively provided with a bearing installation part (3) made of ferrite alloy, the outer side of the bearing installation part (3) on one side is provided with a connecting part (4) made of ferrite alloy, and the outer side of the bearing installation part (3) on the other side is provided with a transmission part (5) made of ferrite alloy.
2. The improved roll of ferritic square steel roughing mill of claim 1 wherein: the width dimension of the rectangular rough rolling ring groove (2) occupies 0.15-0.25 of the length dimension of the roller body (1).
3. The improved roll of ferritic square steel roughing mill of claim 1 wherein: the roller body (1), the bearing installation part (3), the connecting part (4) and the transmission part (5) are of an integrated structure.
4. The method for preparing the improved rough roll of the ferritic square steel as set forth in claim 1, wherein the specific process is as follows:
the roughing roller is prepared from the following raw materials in parts by weight:
3.20 to 3.40 percent of carbon,
2.00 to 2.10 percent of silicon,
0.50 to 0.70 percent of manganese,
0.20 to 0.40 percent of chromium,
0.30 to 0.50 percent of molybdenum,
1.40 to 1.60 percent of nickel,
0.10 to 0.30 percent of niobium,
0.05 to 0.15 percent of vanadium;
step two, slagging pure molten iron during smelting, adding a slagging agent into the furnace when the temperature of the molten iron is 1200-1250 ℃, adding 8-10 kg of slagging agent into each ton of molten iron, removing slag, then adding 2-4 kg of iron-based heavy rare earth molten iron modifier pure molten iron, and discharging the molten iron for spheroidization when the temperature of the molten iron is 1410-1430 ℃;
step three, spraying alcohol-based paint with the thickness of 4-5 mm on a metal section die of the roller;
step four, after the roller is loaded into the furnace, the temperature is raised to 10-15 ℃ per hour, the roller temperature is raised to 44 ℃, the temperature is preserved for 4 hours, then the temperature is raised to 660 ℃, the temperature is preserved for 6 hours, the temperature is raised to 15-20 ℃ per hour, the temperature is preserved for 6 hours when the roller temperature is raised to 880 ℃, and then the temperature is raised to Acm + 20-30 ℃, the temperature is preserved for 8 hours, and the furnace is cooled and tempered;
step five, rolling a metallographic matrix structure, namely a spherical graphite, special fine-grained metal carbide, an iron body and a tempering structure.
5. The method of claim 4, wherein the roll is made of a ferritic square steel, and comprises the following steps: in the first step, the raw material of the roughing roller also contains phosphorus
0.04% of sulfur
0.02% of magnesium
0.04%。
6. The method of claim 4, wherein the roll is made of a ferritic square steel, and comprises the following steps: in the second step, the slag former is prepared by mixing 3-5% of fluorite, 60-80% of white quartz sand and the balance of cullet.
7. The method of claim 4, wherein the roll is made of a ferritic square steel, and comprises the following steps: in the second step, 70 percent of molten iron is firstly nodulized by a nodulizer, 75Si-Fe is added after the nodulization, the Si content is increased by 0.20 to 0.30 percent, BaCa0.10 to 0.20 percent, then 30 percent of molten iron is inoculated, the molten iron is killed for 2 to 3 minutes after slagging off, and casting is carried out at the casting temperature of 1310 to 1320 ℃.
8. The method of claim 7, wherein the roll is made of a ferritic square steel, comprising the steps of: the nodulizer adopts 1.60 percent of low silicon magnesium and 0.20 percent of rare earth magnesium.
9. The method of claim 4, wherein the roll is made of a ferritic square steel, and comprises the following steps: in the fourth step, the roller is thickened, loaded in a furnace and tempered, the temperature is raised to 10-15 ℃ per hour, the temperature is raised to 430-450 ℃ and the furnace cooling is carried out for 8 hours.
10. The method of claim 4, wherein the roll is made of a ferritic square steel, and comprises the following steps: in the fifth step, the hardness of the roll body of the roll is 48 HSD-50 HSD, and the hardness fall from the roll surface to the groove bottom of the hole pattern
1.5 HSD, roll tensile Strength
580MPa。
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| CN112725708A (en) * | 2020-12-01 | 2021-04-30 | 邢台德龙机械轧辊有限公司 | Preparation method of roller for rough rolling of die steel medium plate |
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